After Hungary became the Habsburg empire's anti-Turkish theatre of war in the 16th -17th century, the border defence and border fortress system set up in this area guarded the whole of Central Europe, thus Christendom. This is why early modern-age Hungary was also accorded this title (since Poland was also often referred to as the Bastion of Christianity). In the second half of the 16th century the castle of Győr was granted a similar title becoming known as the Bastion of Vienna and Lower-Austria, while Muraköz was named detached Bastion of Styria.